Water-conduit.



G. KAUFMAN 5: G. MERIWETHER.

WATER OONDUIT. APPLICATION FILED A1 19, 1909.

Patented J an. 2, 1912.

5 mac Mow,

stave. pipes for the purpose.

NTTED STATES PATENT GUSTAVE KAUFMAN, OF NEW YORK, N. Y., AND COLFMAN MER'EVTETHER, 0F MONTCLAIR, JERSEY.

WATERCGNDUIT.

noiaeeo.

Specification of Letters Patent.

Patented Jan. a, rare.

Applicatioufiled April 9, 1909. Serial No. teases.

To all whom it may concern:

Be it known that we, GUSTAVE KAUFMAN and COLEMAN Mnmwn'rnnn, both citizens of the United States, residing, respectively, at New York, in the county and State of New York, and at Montclair, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Water-Conduits, of which the following is a specification.

. In the art of water distribution the F mains are usually pipes composed of iron or steel. Such pipes, however, are subject to rapid deterioration on account of rust, corrosion, electrolytic act-ion, etc., and it has therefore been proposed to use wooden- The latter type of conduit also lacks the desired durability, and hencehas not been resorted to to any considerable extent. The use of reinforced concrete pipe has also been proposed, but the difficulty of making such pipe impervious to Water, particularly at the joints, has heretofore been a bar to the successful employment of such pipe.

We have therefore been led to devise our present invention, which has for its chief object to provide a composite pipe or conduit for conveying water under pressure,. which ipe shall combine with the tensile strength and imperviousness of metal (preferably steel) the durability and corrosionresistant properties of concrete.

A further object. of the invention is to provide a composite pipe in which the material with which the joints are c'alked is wholly embedded in concrete and thereby effectually protected fromthechemical action of the water or of matter dissolved therein.

Tothese and other. ends the invention resides in the novel features hereinafter described, and more particularly set forth in the appended claims.

A convenient form of the invention is illustrated in the annexed drawing, in

which- Figurel shows the conduit in longitudinal section through a joint. Fig. 2 is a detail sectional view illustrating the preferred mode of calking the joints between'the pipe sections, from the inside. Fig. 3 is a similar view showing the construction when the joint is to be calked from the outside.

As before stated, the pipe is composite, being made of metal and concrete. The mecrete applied while plastic, and the dovetail I corrugations serve, as will be readily understood, to eflectually lock the three parts of the pipe section together so that the section is practically an integral structure.

Each pipe-section has a bell-end and a spigot-end, and the foundation tubes are bare of concrete on the inside of the bell and on the outside of the spigot, as shown at i, 5, respectively. The metal lining 4t of the bell is formed by the cylindrical top of one of the circumferential corrugations, and the metal outer surface 5 of the spigot is formed by the bottom of a corrugation, so that when the sections are assembled, as shown in the drawing, the two metal surfaces will be spaced apart radially to leave a calking recess 6. At the same time, the bell and the spigot are difierent in length so as to provide a groove around the pipe.

In the construction shown in Fig. 2, in which the groove, 7, is on the inside, the end of the spigot, and the bottom .of the rabbet inside the hell, are oppositely beveled in order to give the groove an undercut, and in Fig. 3, in which the groove is on the outside, the end of the bell and the bottom of i the rabbet outside the spigot are beveled for the same purpose. The abutting surfaces of the two sections are shaped to conform to each other and are preferably perpendicular tothe axis of the pipe, as indicated at 8. Both bell and spigot may be, and preferably are, reinforced by circumferential metallic rods 9, l0, elnbeddedin the concrete. The sections being assembled as shown, with the spigot of one fitting into the bell of the other, the calking recess -is tightly packed with lead or other suitable material, as indicated at 11, using forthe purpose a bent calking tool 12 by which said recess may be readily reached. When the calk ng is finished the undercut groove, on the ms de or outside as the case may be, is filled with concrete flush with the surface, as indlcated at 13, thus completing the joint.

From the foregoing it will be seen that "foundation pipe is .the tensile strength necessary to withstand the pressure of the water flowing through the pipe is provided by the metal foundation tubes, but that the latter are incased, inside and out, by concrete and are there- 1 fore completely a protected from injury. Thecalking in the joints is also wholly emverse to the axisof the pipe, which serve to resist any secondary stresses that may be set up by theinternal pressure, and to prevent distortion of the pipe or fracture of the concrete by any undue Weight on the pipe or by other external stresses.

The construction specifically described herein is merely the preferred form of the invention, which is capable of being embodied in'various forms Without departure from its proper scope as defined by the appended claims.

, What we claim is: I

. 1. A conduit for conveying water under pressure, comprising a plurality of sections each consisting of a metal foundation pipe roviding the tensile strength to withstand the internal pressure and incased inside and out in concrete and each section having at one end an outer rabbet exposing the foundation pipe and at the other end an internal rabbet exposing the foundation pipe the. foundation pipe at theoutwardly rabeted end being smaller than at the other end whereby to leave a calking space between the foundation pipes of the contiguous sections when the smaller end of the one is 'positioned inthe larger end of the next; and a calking of suitable material in said space.

2. A pipe section for Water conduits,comprising a metal foundation pipe to withstand internal pressure having circumferent-ial corrugations, inner and outer casings of concrete engaging the corrugations and terminating short of the ends of the foundation pipe at opposite extremities of the section to provide bell and spigot ends, circumferential reinforcing members embedded in the outer casing outside of the foundation pipe at the bell end, and circumferential reinforcing members embedded. in the inner casing inside the foundation pipe at the spigot end.

3. A conduit for conveying Water under pressure, comprising a plurality of sections each consisting of an imperforate foundation pipe incased inside and out in concrete and each section having at one end an'outer rabbet exposing the foundation pipe and at the other end an internal rabbet exposing the foundation pipe, the foundation pipe at the outwardly rabbeted end being smaller than at the other end whereby to leave a smooth-surfaced c'alki-ng space between the foundation pipes of the contiguous sections when the smaller'end of the. one is positioned in the larger end of thenext; and' a calking of suitable material in said space.

In testimony whereof we affix our signatures each in the presence of, two subscribing witnesses. v

GUSTAVE "KAUFMAN. COLEMAN MERIWETHER.

Witnesses to the signature of Gustave Kaufman;

ALLAN M. HIBsH, STURGES S. DUNHAM. Witnesses to the signature of Coleman Meriwether W. T. GRAY, CHAS. MERIWETHEH 

